Pattern formation by a moving morphogen source

Jeremiah J. Zartman, Lily S. Cheung, Matthew G. Niepielko, Christine Bonini, Benjamin Haley, Nir Yakoby, Stanislav Y. Shvartsman

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


During Drosophila melanogaster oogenesis, the follicular epithelium that envelops the germline cyst gives rise to an elaborate eggshell, which houses the future embryo and mediates its interaction with the environment. A prominent feature of the eggshell is a pair of dorsal appendages, which are needed for embryo respiration. Morphogenesis of this structure depends on broad, a zinc-finger transcription factor, regulated by the EGFR pathway. While much has been learned about the mechanisms of broad regulation by EGFR, current understanding of processes that shape the spatial pattern of broad expression is incomplete. We propose that this pattern is defined by two different phases of EGFR activation: an early, posterior-to-anterior gradient of EGFR signaling sets the posterior boundary of broad expression, while the anterior boundary is set by a later phase of EGFR signaling, distributed in a dorsoventral gradient. This model can explain the wild-type pattern of broad in D. melanogaster, predicts how this pattern responds to genetic perturbations, and provides insight into the mechanisms driving diversification of eggshell patterning. The proposed model of the broad expression pattern can be used as a starting point for the quantitative analysis of a large number of gene expression patterns in Drosophila oogenesis.

Original languageAmerican English
Article number045003
JournalPhysical biology
Issue number4
StatePublished - Aug 2011

ASJC Scopus subject areas

  • Molecular Biology
  • Biophysics
  • Structural Biology
  • Cell Biology

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